I need the unlocking code fora Grundig CAR200D?

I have just purchased an old "P" reg. Vauxhall Astra with very low milage but it has been off the road for a while and the battery was flat. The radio has gone into the "safe" mode and there is no record of the code in the documents I received. The No. on the side of the radio is :- GM 0200T2690084. Can anyone give me an unlocking code for this radio as I woul like a bit of music on my journeys. Thanks.... Dave the rave.